Contact us
Choose a category below so we can get back to you as quickly as possible.
X+Y=M ==> X=M-Y,代入5X+3Y=31得5(M-Y)+3Y=31 整理得5M-2Y=31, 解出:Y=(5M-31)/2>=0,X=(31-3M)/2>=0 得31/3〉=M>=31/5
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.